// Copyright (c) 2010 SuccessFactors, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//     * Redistributions of source code must retain the above
//       copyright notice, this list of conditions and the following
//       disclaimer.
//
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials
//       provided with the distribution.
//
//     * Neither the name of the SuccessFactors, Inc. nor the names of
//       its contributors may be used to endorse or promote products
//       derived from this software without specific prior written
//       permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.

package org.owasp.jxt.compiler;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

/**
 * JavacCompiler
 *
 * @author Jeffrey Ichnowski
 * @version $Revision: 8 $
 */
public class JavacCompiler extends Compiler {

    private static final int BUFFER_SIZE = 512;

    public final CompileResults compile(String ... classNames) {

        List<String> command = new ArrayList<String>();

        command.add("javac");
        command.add("-d");
        command.add(_destDir.toString());
        command.add("-classpath");
        command.add(_classPath);

        if (_debug) {
            command.add("-g");
        }

        if (_source != null) {
            command.add("-source");
            command.add(_source);
        }

        if (_target != null) {
            command.add("-target");
            command.add(_target);
        }

        for (String className : classNames) {
            command.add(classToSourceFile(className).toString());
        }

        try {
            Process proc = new ProcessBuilder(command)
                .redirectErrorStream(true)
                .start();

            InputStream in = proc.getInputStream();
            InputStreamReader isw = new InputStreamReader(in);
            char[] buf = new char[BUFFER_SIZE];
            StringBuilder output = new StringBuilder();

            int n;
            while ((n = isw.read(buf)) != -1) {
                output.append(buf, 0, n);
            }

            int exitCode = proc.waitFor();

            if (exitCode != 0) {
                output.append("Javac exited with: "+exitCode);
            }

            return new CompileResults(exitCode == 0, output.toString());

        } catch (IOException e) {
            return new CompileResults(e);
        } catch (InterruptedException e) {
            return new CompileResults(e);
        }
    }

} // JavacCompiler
